Updated October 2026
Data from Amazon and official iRobot site.
2026 verdict
Prices and platform timing are what separate these two iRobot robot vacuum combos, and the iRobot Roomba Plus 678 Combo Robot + AutoWash Dock wins this one because it is the more affordable of the pair.
It shares the 30,000 Pa suction rating and the LiDAR mapping of the iRobot Roomba Max 775 Combo Robot + AutoWash Dock, and it adds a heated two-step roller mop that sprays stains before it scrubs, in a slightly slimmer body. The iRobot Roomba Max 775 Combo Robot + AutoWash Dock is the one to pick if you want Matter live today, since it already reaches Apple Home, SmartThings and Home Assistant while the Plus 678 is still going through certification. Choose the iRobot Roomba Plus 678 Combo Robot + AutoWash Dock for value and the newer mop, and the iRobot Roomba Max 775 Combo Robot + AutoWash Dock for mature ecosystem support.
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| Feature | iRobot Roomba Max 775 Combo Robot + AutoWash Dock | iRobot Roomba Plus 678 Combo Robot + AutoWash Dock | Winner |
|---|---|---|---|
| Price | $999.79 | $899.99 | iRobot Roomba Plus 678 Combo Robot + AutoWash Dock |
| Warranty | 1 year | 1 year | Tie |
| Auto Recharge | YES | YES | Tie |
| Connectivity | 2.4 GHz WiFi, Bluetooth | 2.4 GHz WiFi | Tie |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Tie |
| Navigation Type | Laser (LiDAR) | Laser (LiDAR) | Tie |
| Obstacle Detection | YES | YES | Tie |
| Cliff Detection | YES | YES | Tie |
| Multi-Room Mapping | YES | YES | Tie |
| No-Go Zones | YES | YES | Tie |
| Suction Power | 30000Pa | 30000Pa | Tie |
| Carpet Cleaning | YES | YES | Tie |
What the differences mean
Matter timing
The iRobot Roomba Max 775 Combo Robot + AutoWash Dock is already Matter certified and reaches Apple Home, SmartThings and Home Assistant now. The iRobot Roomba Plus 678 Combo Robot + AutoWash Dock is going through Matter certification and works through Alexa, Google Home and Siri Shortcuts until it ships.
Mopping
The iRobot Roomba Plus 678 Combo Robot + AutoWash Dock pre-treats stains with a pressurized SprayForce spray and scrubs with a heated PowerSpin roller that reaches into edges. The iRobot Roomba Max 775 Combo Robot + AutoWash Dock relies on spinning pads without the heated pre-treatment, though both dose detergent automatically.
Size and weight
The iRobot Roomba Plus 678 Combo Robot + AutoWash Dock is the slimmer and lighter of the two, at 99.8 mm tall and 4.85 kg against 105 mm and 5.72 kg for the iRobot Roomba Max 775 Combo Robot + AutoWash Dock.
Positioning
The iRobot Roomba Plus 678 Combo Robot + AutoWash Dock is the more affordable of the pair. The iRobot Roomba Max 775 Combo Robot + AutoWash Dock charges more for live Matter support and the Max tier's build.
Which one to buy if
- you use Apple Home, SmartThings or Home Assistant today
The iRobot Roomba Max 775 Combo Robot + AutoWash Dock is Matter certified and reaches those platforms now.
- you want the lower price of the pair
The iRobot Roomba Plus 678 Combo Robot + AutoWash Dock is the more affordable robot.
- you want the more advanced heated mop
The iRobot Roomba Plus 678 Combo Robot + AutoWash Dock sprays stains and scrubs with a heated roller.
- you want the slimmer robot under low furniture
The iRobot Roomba Plus 678 Combo Robot + AutoWash Dock is 99.8 mm tall and lighter than the other.
$999.79
- - Price: $999.79 vs $899.99
Winner
$899.99
- + Price: $899.99
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- iRobot Roomba Max 775 Combo Robot + AutoWash Dock
- iRobot Roomba Plus 678 Combo Robot + AutoWash Dock
Loading price history...
Frequently Asked Questions
Which is better overall: iRobot Roomba Max 775 Combo Robot + AutoWash Dock or iRobot Roomba Plus 678 Combo Robot + AutoWash Dock?
The iRobot Roomba Plus 678 Combo Robot + AutoWash Dock on value, since it costs less, matches the 30,000 Pa suction rating and adds a heated two-step mop. The iRobot Roomba Max 775 Combo Robot + AutoWash Dock is the pick if you need Matter working today.
What is the biggest difference between the iRobot Roomba Max 775 Combo Robot + AutoWash Dock and the iRobot Roomba Plus 678 Combo Robot + AutoWash Dock?
Matter readiness. The iRobot Roomba Max 775 Combo Robot + AutoWash Dock is already certified for Apple Home, SmartThings and Home Assistant, while the iRobot Roomba Plus 678 Combo Robot + AutoWash Dock is still going through certification.
Do these two Roombas have the same suction?
Yes. The iRobot Roomba Max 775 Combo Robot + AutoWash Dock and the iRobot Roomba Plus 678 Combo Robot + AutoWash Dock are both rated at 30,000 Pa, so the choice comes down to price, smart home timing and the mop rather than power.
Do both empty and wash their own mops?
Yes. Both the iRobot Roomba Max 775 Combo Robot + AutoWash Dock and the iRobot Roomba Plus 678 Combo Robot + AutoWash Dock self-empty the bin and wash, dry and dose their mops at an AutoWash dock, with no dust bags to change often.
Who should buy the iRobot Roomba Max 775 Combo Robot + AutoWash Dock?
A household that needs Matter, Apple Home, SmartThings or Home Assistant working today and wants the Max tier build, and that does not mind paying more.
Who should buy the iRobot Roomba Plus 678 Combo Robot + AutoWash Dock?
A buyer who wants the same suction and LiDAR mapping for less, plus a heated roller mop, and who can use Alexa, Google Home or Siri Shortcuts without Matter.
Full comparison table
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